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Previous studies have suggested low levels of vitamin D in the body are to blame for increased Alzheimer's risksand the acceleration of multiple sclerosis.
In geographical areas where the sun is not abundant, many populations turn to vitamin D supplementation for health benefits.
Researchers from this latest study, led by Dr. Emad Al-Dujaili, say previous studies have suggested that vitamin D can block the action of an enzyme called 11-βHSD1, which assists in making the stress hormone cortisol.
High levels of this stress hormone can increase blood pressure by restricting the arteries, narrowing blood vessels and encouraging the kidneys to retain water, say the researchers.
Because vitamin D may reduce levels of cortisol in the body, the researchers theorized that it could improve exercise performance and lower risk factors for cardiovascular issues.